if err != nil {
		t.Fatal(err)
	}

	erasureDisks := xl.getDisks()
	z.serverPools[0].erasureDisksMu.Lock()
	xl.getDisks = func() []StorageAPI {
		for i := range erasureDisks[:6] {
			erasureDisks[i] = newNaughtyDisk(erasureDisks[i], nil, errFaultyDisk)
		}
		return erasureDisks
	}

		}); err != nil {
			t.Fatal(err)
		}
	}

	setDisks(nil, nil, nil, nil)

	rd := mustGetPutObjReader(t, bytes.NewReader(data), int64(len(data)), "", "")
	_, err = objLayer.PutObject(ctx, bucket, object, rd, ObjectOptions{
		Versioned: true,
	})
	if err != nil {
		t.Fatal(err)
	}

	setDisks(orgDisks[:4]...)
	disk := getDisk(0)

	// Simulate read quorum failure by taking enough disks offline
	// With 16 disks (EC 8+8), read quorum is 9. Taking 8 disks offline leaves only 8,
	// which is below read quorum.
	erasureDisks := xl.getDisks()
	z.serverPools[0].erasureDisksMu.Lock()
	xl.getDisks = func() []StorageAPI {
		for i := range erasureDisks[:8] {
			erasureDisks[i] = nil
		}
		return erasureDisks
	}
	z.serverPools[0].erasureDisksMu.Unlock()

// erasureObjects - Implements ER object layer.
type erasureObjects struct {
	setDriveCount      int
	defaultParityCount int

	setIndex  int
	poolIndex int

	// getDisks returns list of storageAPIs.
	getDisks func() []StorageAPI

	// getLockers returns list of remote and local lockers.
	getLockers func() ([]dsync.NetLocker, string)

	// getEndpoints returns list of endpoint belonging this set.

package cmd

import (
	"context"
	"math/rand"
	"sync"
	"time"
)

func (er erasureObjects) getOnlineDisks() (newDisks []StorageAPI) {
	disks := er.getDisks()
	var wg sync.WaitGroup
	var mu sync.Mutex
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for _, i := range r.Perm(len(disks)) {
		wg.Add(1)
		go func() {
			defer wg.Done()
			if disks[i] == nil {

	if err != nil {
		t.Fatalf("Failed to make a bucket %v", err)
	}

	object := "object"
	data := bytes.Repeat([]byte("a"), smallFileThreshold*32)
	z := obj.(*erasureServerPools)

	erasureDisks, err := z.GetDisks(0, 0)
	if err != nil {
		t.Fatal(err)
	}

	for i, test := range testCases {
		t.Run(fmt.Sprintf("case-%d", i), func(t *testing.T) {

	// Simulate read quorum failure by taking enough disks offline
	// With 16 disks (EC 8+8), read quorum is 9. Taking 8 disks offline leaves only 8,
	// which is below read quorum.
	erasureDisks := xl.getDisks()
	z.serverPools[0].erasureDisksMu.Lock()
	xl.getDisks = func() []StorageAPI {
		for i := range erasureDisks[:8] {
			erasureDisks[i] = nil
		}
		return erasureDisks
	}
	z.serverPools[0].erasureDisksMu.Unlock()

		if err != nil {
			return oi, err
		}
		ctx = lkctx.Context()
		defer lk.Unlock(lkctx)
	}
	// Read metadata associated with the object from all disks.
	storageDisks := er.getDisks()

	var metaArr []FileInfo
	var errs []error

	// Read metadata associated with the object from all disks.
	if srcOpts.VersionID != "" {

	defer func() {
		if errors.Is(err, errFileNotFound) {
			err = errUploadIDNotFound
		}
	}()

	uploadIDPath := er.getUploadIDDir(bucket, object, uploadID)

	storageDisks := er.getDisks()

	// Read metadata associated with the object from all disks.
	partsMetadata, errs := readAllFileInfo(ctx, storageDisks, bucket, minioMetaMultipartBucket,
		uploadIDPath, "", false, false)

		}

		// All operations are performed without locks, so we must be careful and allow for failures.
		// Read metadata associated with the object from a disk.
		if retries > 0 {
			for _, disk := range er.getDisks() {
				if disk == nil {
					continue
				}
				if !disk.IsOnline() {
					continue
				}
				_, err := disk.ReadVersion(ctx, "", minioMetaBucket,
					o.objectPath(0), "", ReadOptions{})